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Problem 56 Easy Difficulty

If $ x = \ln (\sec \theta + \tan \theta), $ show that $ \sec \theta = \cosh x. $

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Video Transcript

we know that we can rewrite this as 1/2 times e to the X plus e to the negative box. Therefore, using the pipe Iram identity of one plus tan squirt of data is equivalent to seek it. Square data. We have 1/2 times two seek it, beta. Therefore, we know that coastline H of X is the same thing as seeking data.